Mehtod of casting cylinders.



PATBNTED MAR. 31, 1903.

A. WALDER & J. T. SOHAFFER.

METHOD OF CASTING CYLINDERS.

APPLICATION FILED MAR. 27. 1901.

2 SHEETS-SHEET 1.

N0 MODEL- ..Fig. l.

VIII/I111.

5210M, MwL 775% No. 724,353. PATENTED MAR. 31, 1903.

A. WALDER & J. T. SOHAFFER. METHOD OF CASTING UYLINDERS. I

APPLICATION FILED MAR, 27, 1901.

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UNITED STATES PATENT OFFICE. I

AMOS WALDER AND JOHN T. SOHAFFER, OF ROCHESTER, NE\V YORK, ASSIGNORS OF ONE-THIRD TO JOHN O. BREWSTER, OF ROCHESTER,

NE W YORK.

METHOD OF CASTING CYLINDERS.

SPECIFICATION forming part of Letters Patent N 0. 724,353, dated March 31, 1903.

Application filed March 27, 1901. Serial No. 53,076, (No model.)

cylinders having lateral arms, trunnions, or

other projections, such as are used for bydraulic presses, riveters, and many other pur poses; and our invention consists in so casting the arms, trunnions, or other projections on the cylinder that a sound casting may be produced free from porous or spongy defects or blow-holes.

To more fully describe our invention, reference is had to the accompanying drawings, iuwhich like letters of reference are applied to the same parts in the several views.

Figure 1 is a side view of our improved cylinder, partly in section. Figs. 2 and 3 represent the shell detached. Fig. 4 is an end elevation of a cylinder for a hydraulic press, partly in section; and Fig. 5 isasection of the shell on the line 5 5 of Figs. 2 and 3.

A is a hollow cylindrical shell of suitable metal, provided with the hollow boss D at its outer end, to which the pipe conveying the pressure fluid to the interior of the cylinder is attached.

To the shell A, suitably located in respect to the casting B, hereinafter described, is secured a projecting plate K, supported by or attached to the exterior surface of the shell and separated therefrom in any suitable manner, such as by means of the studs J.

Surrounding the shell A is a casting B,

provided with a laterally-projecting arm 0,-

and the projecting plate H on the shell A is so disposed in relatiofi to the casting B that it is located opposite the lateral arm 0 of the same, so that when the casting B is cast around the shell A the molten metal completely envelops the plate and, becoming set, is firmly embedded between the plate and shell, thereby securely uniting the parts to-.

junction of the arm 0 with the body of the casting.

We prefer to cast the plate and studs with the shell A, so that they are all integrally of the same metal; but it is obvious that the plate may be supported in any other suitable Way. The plate may be straight or curved, as desired, and it may be of any suitable size relative to the dimensions of the arm 0, and in order further to facilitate the incorporation of the metal of the plate with the metal of the casting B we provide the plate with one or more perforations K, so that the metal of the casting B when in its molten state fills up these perforations and more perfectly unites the plate with thecasting when finally set. In the drawings we haverepresented the plate in suitable relative arrangement and with perforations substantially such as we have used successfully in casting cylinders for forty-inch hydraulic presses, in which, as there are two projecting arms 0 O, we employ the two plates H H. The shell may be bored or otherwise fitted for the ram or plunger before or after the cylinder is cast around it.

E represents a projecting base or foot plate to support the cylinder, and F F are openings in the arms for the frame of the press.

In the production of our improved cylinder we first cast the hollow shell A of suitable size, which is placed in the mold in which the casting B, with its arm or projection O, is

subsequently cast. Ordinarily in this operation it is found that the metal is porous or full of blow-holes at the j auction of the arm with the body or that the shell becomes defective opposite the arm, and it is therefore difiicult to obtain soundcastings, and for the express purpose of obviating this trouble we form on or attach to the outer surface of the shell A, opposite the inner end of the arm 0 of the casting B, the projecting plate H, as above described, so as to allow. the molten metal to run into the space I between the plate and the shell for firmly uniting the shell, plate, and casting.

The mold is preferably arranged so that the shell A stands in a vertical position at the time of casting thev cylinder B around it.

Thus it will be seen that by our invention we secure with certainty sound cylinder-castings of the largest sizes and adapted for all purposes to which such cylinders can be applied. Our invention is also applicable to casting cylinders of metal other. than castiron.

Having thus described our invention, what we claim, and desire to secure by Letters Patand the projecting plate.

3. A cylinder comprising a shell provided with a plurality of projecting plates secured to but separated therefrom, and a casting surrounding said shell and provided with lateral arms located opposite said projecting plates, a portion of said casting engaging said shell beneath said projecting plates for perfecting thejoinderof the shell and casting at the point opposite the lateral arms.

4. A cylinder comprising a shell provided with a plurality of perforated projecting plates secured to but separated therefrom, and a casting surrounding said shell and provided with lateral arms located opposite said projecting plates, a portion of said casting engaging said projecting plates and shell in the space formed between the shell and projecting plates, for more perfectly uniting together the shell and casting.

5. The herein-described method of prevent ing flaws in the casting of cylinders having one or more projecting arms or trunnions, which consists in placing in a suitable mold a shell having one or more projecting plates attached' thereto registering with the proposed position of said arms, with a passage for the molten metal between said plates and the shell, and in subsequently filling the mold with the molten metal, substantially as and for the purposes described.

6. The method of preventing flaws in the casting of heavy metallic bodies provided with laterally-projecting arms, which consists in placing in a suitable mold a metallic mass having oneor more projecting platesattached thereto registering with the proposed position of said arms, with passages for the molten metal between said plates and said mass, and subsequently filling the mold with molten metal, substantially as described.

AMOS \VALDER. JOHN T. SCHAFFER.

Witnesses:

GEO. B. SELDEN, H. R. SELDEN. 

